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How to find the equation of a tangent to a curve at a specific point.

The first thing to remember is that the tangent to the curve at a given point has the same gradient as the curve at that point. Let's consider the general case y=f(x) at a point c=(x1,y1). Step 1:We have to ...
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Answered by Rafe L. • Maths tutor
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Integrating cos^2(x)+5sin^2(x)

Firstly, note that cos^2(x)+5sin^2(x)= cos^2(x) +sin^2(x) +4sin^2(x). By trignoemtric identies, cos^2(x)+sin^2(x)=1 and so we can just integrate 1+4sin^2(x) since this is equal to cos^2(x)+5sin^2(x). Again, ...
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Answered by Rafe L. • Maths tutor
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Is breaking bonds endothermic or exothermic?

A quick way to remember this is BENDO MEX: B reaking bonds is ENDO thermic = +ve enthalpy change M aking bonds is EX othermic = -ve enthalpy change
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Answered by Laura S. • Chemistry tutor
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What is the diRfference between Oxidation and Reduction?

An easy way to remember the difference between Oxidation and Reduction is OIL RIG: O xidation I s L oss (of electrons) R eduction I s G ain (of electrons) Oxidation involves the gain of electrons (or oxygen)...
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Answered by Laura S. • Chemistry tutor
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What are the differences between Carbohydrates and Lipids?

Carbohydrates - 17 kJ of energy per gram - Disaccharides = highly soluble. Polysaccharides = insoluble - Less metabolic water produced - Stored as STARCH in plants and GLYCOGEN in animals - Monomer = Glucose...
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Answered by Laura S. • Biology tutor
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